When we attempting to send a scheduled report to an external failed with the following error: address error. [CrystalEnterprise.Smtp]: [Error sending address(es) to SMTP server. Return code: [SMTP 550 - Requested action not taken: mailbox unavailable.]. Reason: [xxxxxx@gmail.com].]
Details: Office365 and CR2016 web server Tomcat
Please any advice.